let's say that someone was able to take the grain textures from the alexa 35 and make them available for use in your NLE of choice. you would then be able to put them over footage from any camera to achieve the look of those in-camera only textures. that would be sick, too bad these are "not" the alexa 35 textures.
 
this free pack includes 4 .mov files that look eerily similar to the alexa 35 nostalgic textures. there will be four files in 3:2 open gate. all files are HD. 
 
just place over footage and change the composite to "overlay". now your footage is "not" the alexa 35.
 
Included:
MBC Not Soft Nostalgic 35mm.mov
MBC Not Nostalgic 35mm.mov
MBC Not Super Nostalgic 35mm.mov
MBC Not Extreme Nostalgic 35mm.mov